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md: avoid possible spinning md thread at shutdown.

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If an md array with externally managed metadata (e.g. DDF or IMSM)
is in use, then we should not set safemode==2 at shutdown because:

1/ this is ineffective: user-space need to be involved in any 'safemode' handling,
2/ The safemode management code doesn't cope with safemode==2 on external metadata
   and md_check_recover enters an infinite loop.

Even at shutdown, an infinite-looping process can be problematic, so this
could cause shutdown to hang.

Cc: stable@vger.kernel.org (any kernel)
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2014-05-06 09:36:08 +10:00
parent cc13b1d150
commit 0f62fb220a
1 changed files with 2 additions and 1 deletions
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3
drivers/md/md.c
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@ -8516,7 +8516,8 @@ static int md_notify_reboot(struct notifier_block *this,
if (mddev_trylock(mddev)) {
if (mddev->pers)
__md_stop_writes(mddev);
mddev->safemode = 2;
if (mddev->persistent)
mddev->safemode = 2;
mddev_unlock(mddev);
}
need_delay = 1;